emacs: l/kill-this-buffer: use regex match for with-editor-cancel
emacs: l/kill-this-buffer: use regex match for with-editor-cancel

Sometimes buffers are named with a disambiguating suffix, so plain
string matching won't work. Hence we use regexes.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg